Crup

A Crup is a wizard-bred dog that strongly resembles a Jack Russell Terrier, except that a Crup has a forked tail. They are clearly wizard-bred dogs since they are extremely loyal to wizards, and ferocious toward Muggles. They will eat almost anything.

Crup owners are required by law to remove the second tail of the animal when it is six to eight weeks old, using a painless Severing Charm, in case they are noticed by Muggles. A licence from the Department for the Regulation and Control of Magical Creatures must also be obtained, and the owner must pass a test to show that they are able to control the animal in Muggle-inhabited areas.